# Problem: A solution contains 0.115 mol H2O and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30oC is 25.5 torr. The vapor pressure of pure water at 30oC is 31.5 torr. Calculate the number of moles of sodium chloride in the solution.

###### FREE Expert Solution

We are going to calculate the number of soles of sodium chloride in the solution.

We are going to do the following steps:

Step 1: Determine mole fraction of the solvent

Step 2: Determine the mole fraction of the solute

97% (412 ratings) ###### Problem Details

A solution contains 0.115 mol H2O and an unknown number of moles of sodium chloride. The vapor pressure of the solution at 30oC is 25.5 torr. The vapor pressure of pure water at 30oC is 31.5 torr. Calculate the number of moles of sodium chloride in the solution.

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Our tutors have indicated that to solve this problem you will need to apply the The Colligative Properties concept. You can view video lessons to learn The Colligative Properties. Or if you need more The Colligative Properties practice, you can also practice The Colligative Properties practice problems.